Back
Glaphyrocysta spineta
Glaphyrocysta spineta (Eaton, 1976, p.259-260, pl.8, fig.3; text-fig.12) Stover and Evitt, 1978, p.50.
Originally Cyclonephelium, subsequently Glaphyrocysta?, thirdly (and now) Glaphyrocysta. Questionable assignment: Stover and Evitt (1978, p.50) - however, Michoux and Soncini in Fauconnier and Masure (2004, p.249) retained this species in Glaphyrocysta without question.
Holotype: Eaton, 1976, pl.8, fig.3; text-fig.12; Bujak et al., 1980, pl.9, figs.10–11; Fauconnier and Masure, 2004, pl.34, fig.1.
Age: Early-Mid Eocene.
Original diagnosis: Eaton, 1976, p. 259: Cyclonephelium spinetum
Cyst body dorsoventrally flattened with a smooth or finely granular surface. The circular or subcircular outline may be modified by the development of an antapical protuberance. Processes, restricted to the peripheral zone of the cyst body, broad and membranous, and distally expanded and united by membranous, arched trabeculae of variable width which bear numerous acuminate spines. Archaeopyle apical, tetratabular.
Dimensions: Holotype: cyst body (without operculum) 55x65 µm; length of processes up to 22 µm. Observed range: cyst body (without operculum) 40x55 µm to 58x68 µm; length of processes up to 36 µm. (n = 10).
Affinities:
Eaton, 1976, p. 260: Cyclonephelium spinetum
The membranous processes are smooth or finely striated. They show considerable variation in breadth, varying from very broad and proximally closely spaced to narrow and proximally widely spaced. The overall form of the processes is broadly T-shaped. The acuminate spines projecting from the distal trabeculae show considerable variation in length, while the trabeculae themselves vary from broad and ribbon-like to slender strands. Cyclonephelium spinetum is similar to C. Iaciniiforme Gerlach 1961 in overall form, but differs in having numerous acuminate spines projecting from the distal trabeculae. Acuminate spines are also developed in C. divaricatum Williams & Downie 1966, but this species does not have the broad membranous processes which are typical of C. spinetum.
Originally Cyclonephelium, subsequently Glaphyrocysta?, thirdly (and now) Glaphyrocysta. Questionable assignment: Stover and Evitt (1978, p.50) - however, Michoux and Soncini in Fauconnier and Masure (2004, p.249) retained this species in Glaphyrocysta without question.
Holotype: Eaton, 1976, pl.8, fig.3; text-fig.12; Bujak et al., 1980, pl.9, figs.10–11; Fauconnier and Masure, 2004, pl.34, fig.1.
Age: Early-Mid Eocene.
Original diagnosis: Eaton, 1976, p. 259: Cyclonephelium spinetum
Cyst body dorsoventrally flattened with a smooth or finely granular surface. The circular or subcircular outline may be modified by the development of an antapical protuberance. Processes, restricted to the peripheral zone of the cyst body, broad and membranous, and distally expanded and united by membranous, arched trabeculae of variable width which bear numerous acuminate spines. Archaeopyle apical, tetratabular.
Dimensions: Holotype: cyst body (without operculum) 55x65 µm; length of processes up to 22 µm. Observed range: cyst body (without operculum) 40x55 µm to 58x68 µm; length of processes up to 36 µm. (n = 10).
Affinities:
Eaton, 1976, p. 260: Cyclonephelium spinetum
The membranous processes are smooth or finely striated. They show considerable variation in breadth, varying from very broad and proximally closely spaced to narrow and proximally widely spaced. The overall form of the processes is broadly T-shaped. The acuminate spines projecting from the distal trabeculae show considerable variation in length, while the trabeculae themselves vary from broad and ribbon-like to slender strands. Cyclonephelium spinetum is similar to C. Iaciniiforme Gerlach 1961 in overall form, but differs in having numerous acuminate spines projecting from the distal trabeculae. Acuminate spines are also developed in C. divaricatum Williams & Downie 1966, but this species does not have the broad membranous processes which are typical of C. spinetum.